Accuracy Test of the Absolute Gravimeter FG5X-246

• Main Authors: ZHAN Jingang, WANG Yong, BAI Lei, ZHANG Erlin, YAO Yixin
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2017-04-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: absolute gravity measurements; accuracy test of gravity measurement; weak force test platform
• Online Access: http://html.rhhz.net/CHXB/html/2017-4-436.htm

The observation accuracy of the absolute gravimeter FG5X-246 is tested by using the weak force test platform. The disturbing gravity field, which is produced by changing the distance between the disturbing mass and the observation point, can be superposed on the background gravity field directly. It is measured that this gravity change using FG5X-246 absolute gravimeter and compared it with that of theoretical disturbing gravity field and then determined the accuracy of the absolute gravity observations. The test results show that when the height of the disturbing mass changes from 1.810 4 m to 1.409 9 m, the disturbing gravity field changes for 48.81 <i>μ</i>Gal (1 Gal=1 cm/s²), while FG5X-246 absolute gravimeter senses the gravity change of 48.0 <i>μ</i>Gal, and the difference between the measurement value and the theoretical value is 0.81 <i>μ</i>Gal. When the height changes from 1.810 4 m to 1.010 1 m, the disturbing gravity field changes for -15.44 <i>μ</i>Gal, while FG5X-246 absolute gravimeter senses the gravity change of -16.20 <i>μ</i>Gal, the difference of them is 0.76 <i>μ</i>Gal. When the height changes from 1.409 9 m to 1.010 1 m, the disturbing gravity field changes for-64.20 <i>μ</i>Gal, while FG5X-246 absolute gravimeter senses the gravity change of -64.25 <i>μ</i>Gal, the difference of them is 0.05 <i>μ</i>Gal.The results indicate that the FG5X-246 absolute gravimeter sensing external gravity change error is no more than 1 <i>μ</i>Gal, that is, the accuracy of the measured value is better than 1 <i>μ</i>Gal.